| 1 | //filter_agc.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009 |
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| 5 | * |
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| 6 | * This file is part of libroardsp a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroardsp is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 22 | * |
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| 23 | */ |
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| 24 | |
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| 25 | #include "libroardsp.h" |
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| 26 | |
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| 27 | int roardsp_agc_init (struct roardsp_filter * filter, struct roar_stream * stream, int id) { |
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| 28 | struct roardsp_agc * self = roar_mm_malloc(sizeof(struct roardsp_agc)); |
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| 29 | |
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| 30 | if ( self == NULL ) |
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| 31 | return -1; |
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| 32 | |
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| 33 | memset(self, 0, sizeof(struct roardsp_agc)); |
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| 34 | |
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| 35 | if ( roardsp_filter_new(&(self->amp), stream, ROARDSP_FILTER_AMP) == -1 ) { |
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| 36 | roar_mm_free(self); |
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| 37 | return -1; |
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| 38 | } |
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| 39 | |
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| 40 | filter->inst = (void*) self; |
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| 41 | |
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| 42 | if ( roardsp_filter_reset(filter, ROARDSP_RESET_FULL) == -1 ) { |
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| 43 | roardsp_agc_uninit(filter); |
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| 44 | return -1; |
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| 45 | } |
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| 46 | |
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| 47 | return 0; |
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| 48 | } |
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| 49 | |
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| 50 | int roardsp_agc_uninit (struct roardsp_filter * filter) { |
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| 51 | struct roardsp_agc * self = filter->inst; |
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| 52 | |
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| 53 | roardsp_filter_free(self->amp); |
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| 54 | roar_mm_free(self); |
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| 55 | return 0; |
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| 56 | } |
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| 57 | |
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| 58 | int roardsp_agc_ctl (struct roardsp_filter * filter, int cmd, void * data) { |
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| 59 | struct roardsp_agc * self = filter->inst; |
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| 60 | |
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| 61 | return -1; |
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| 62 | } |
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| 63 | |
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| 64 | int roardsp_agc_reset (struct roardsp_filter * filter, int what) { |
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| 65 | struct roardsp_agc * self = filter->inst; |
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| 66 | |
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| 67 | switch (what) { |
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| 68 | case ROARDSP_RESET_NONE: |
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| 69 | return 0; |
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| 70 | break; |
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| 71 | case ROARDSP_RESET_FULL: |
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| 72 | if ( filter->bits < 4 ) |
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| 73 | return -1; |
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| 74 | |
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| 75 | self->target_amp = 1 << (filter->bits - 3); |
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| 76 | |
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| 77 | if ( roardsp_filter_reset(self->amp, ROARDSP_RESET_FULL) == -1 ) |
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| 78 | return -1; |
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| 79 | |
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| 80 | return -1; |
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| 81 | break; |
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| 82 | case ROARDSP_RESET_STATE: |
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| 83 | if ( roardsp_filter_reset(self->amp, ROARDSP_RESET_STATE) == -1 ) |
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| 84 | return -1; |
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| 85 | return -1; |
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| 86 | break; |
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| 87 | default: return -1; |
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| 88 | } |
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| 89 | |
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| 90 | return 0; |
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| 91 | } |
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| 92 | |
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| 93 | //ll |
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